meggert
c7ec9726c4
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227 lines
11 KiB
C++
227 lines
11 KiB
C++
#include "PtgCtrl.h"
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#include <fsfw/globalfunctions/constants.h>
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#include <fsfw/globalfunctions/math/MatrixOperations.h>
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#include <fsfw/globalfunctions/math/QuaternionOperations.h>
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#include <fsfw/globalfunctions/math/VectorOperations.h>
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#include <fsfw/globalfunctions/sign.h>
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PtgCtrl::PtgCtrl(AcsParameters *acsParameters_) { acsParameters = acsParameters_; }
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PtgCtrl::~PtgCtrl() {}
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acs::ControlModeStrategy PtgCtrl::pointingCtrlStrategy(
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const bool magFieldValid, const bool mekfValid, const bool strValid, const bool questValid,
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const bool fusedRateValid, const uint8_t rotRateSource, const uint8_t mekfEnabled) {
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if (not magFieldValid) {
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return acs::ControlModeStrategy::CTRL_NO_MAG_FIELD_FOR_CONTROL;
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} else if (mekfEnabled and mekfValid) {
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return acs::ControlModeStrategy::PTGCTRL_MEKF;
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} else if (strValid and fusedRateValid and rotRateSource > acs::RotRateSource::SUSMGM) {
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return acs::ControlModeStrategy::PTGCTRL_STR;
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} else if (questValid and fusedRateValid and rotRateSource > acs::RotRateSource::SUSMGM) {
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return acs::ControlModeStrategy::PTGCTRL_QUEST;
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} else {
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return acs::ControlModeStrategy::CTRL_NO_SENSORS_FOR_CONTROL;
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}
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}
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void PtgCtrl::ptgLaw(AcsParameters::PointingLawParameters *pointingLawParameters,
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const double *errorQuat, const double *deltaRate, const double *rwPseudoInv,
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double *torqueRws) {
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//------------------------------------------------------------------------------------------------
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// Compute gain matrix K and P matrix
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//------------------------------------------------------------------------------------------------
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double om = pointingLawParameters->om;
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double zeta = pointingLawParameters->zeta;
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double qErrorMin = pointingLawParameters->qiMin;
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double omMax = pointingLawParameters->omMax;
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double qError[3] = {errorQuat[0], errorQuat[1], errorQuat[2]};
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double cInt = 2 * om * zeta;
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double kInt = 2 * pow(om, 2);
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double qErrorLaw[3] = {0, 0, 0};
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for (int i = 0; i < 3; i++) {
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if (std::abs(qError[i]) < qErrorMin) {
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qErrorLaw[i] = qErrorMin;
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} else {
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qErrorLaw[i] = std::abs(qError[i]);
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}
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}
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double qErrorLawNorm = VectorOperations<double>::norm(qErrorLaw, 3);
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double gain1 = cInt * omMax / qErrorLawNorm;
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double gainVector[3] = {0, 0, 0};
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VectorOperations<double>::mulScalar(qErrorLaw, gain1, gainVector, 3);
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double gainMatrixDiagonal[3][3] = {{0, 0, 0}, {0, 0, 0}, {0, 0, 0}};
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double gainMatrix[3][3] = {{0, 0, 0}, {0, 0, 0}, {0, 0, 0}};
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gainMatrixDiagonal[0][0] = gainVector[0];
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gainMatrixDiagonal[1][1] = gainVector[1];
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gainMatrixDiagonal[2][2] = gainVector[2];
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MatrixOperations<double>::multiply(*gainMatrixDiagonal,
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*(acsParameters->inertiaEIVE.inertiaMatrixDeployed),
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*gainMatrix, 3, 3, 3);
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// Inverse of gainMatrix
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double gainMatrixInverse[3][3] = {{0, 0, 0}, {0, 0, 0}, {0, 0, 0}};
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gainMatrixInverse[0][0] = 1 / gainMatrix[0][0];
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gainMatrixInverse[1][1] = 1 / gainMatrix[1][1];
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gainMatrixInverse[2][2] = 1 / gainMatrix[2][2];
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double pMatrix[3][3] = {{0, 0, 0}, {0, 0, 0}, {0, 0, 0}};
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MatrixOperations<double>::multiply(
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*gainMatrixInverse, *(acsParameters->inertiaEIVE.inertiaMatrixDeployed), *pMatrix, 3, 3, 3);
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MatrixOperations<double>::multiplyScalar(*pMatrix, kInt, *pMatrix, 3, 3);
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//------------------------------------------------------------------------------------------------
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// Torque Calculations for the reaction wheels
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//------------------------------------------------------------------------------------------------
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double pError[3] = {0, 0, 0};
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MatrixOperations<double>::multiply(*pMatrix, qError, pError, 3, 3, 1);
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double pErrorSign[3] = {0, 0, 0};
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for (int i = 0; i < 3; i++) {
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if (std::abs(pError[i]) > 1) {
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pErrorSign[i] = sign(pError[i]);
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} else {
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pErrorSign[i] = pError[i];
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}
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}
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// torque for quaternion error
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double torqueQuat[3] = {0, 0, 0};
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MatrixOperations<double>::multiply(*gainMatrix, pErrorSign, torqueQuat, 3, 3, 1);
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VectorOperations<double>::mulScalar(torqueQuat, -1, torqueQuat, 3);
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// torque for rate error
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double torqueRate[3] = {0, 0, 0};
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MatrixOperations<double>::multiply(*(acsParameters->inertiaEIVE.inertiaMatrixDeployed), deltaRate,
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torqueRate, 3, 3, 1);
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VectorOperations<double>::mulScalar(torqueRate, cInt, torqueRate, 3);
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VectorOperations<double>::mulScalar(torqueRate, -1, torqueRate, 3);
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// final commanded Torque for every reaction wheel
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double torque[3] = {0, 0, 0};
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VectorOperations<double>::add(torqueRate, torqueQuat, torque, 3);
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MatrixOperations<double>::multiply(rwPseudoInv, torque, torqueRws, 4, 3, 1);
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VectorOperations<double>::mulScalar(torqueRws, -1, torqueRws, 4);
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}
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void PtgCtrl::ptgNullspace(AcsParameters::PointingLawParameters *pointingLawParameters,
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const int32_t speedRw0, const int32_t speedRw1, const int32_t speedRw2,
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const int32_t speedRw3, double *rwTrqNs) {
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// concentrate RW speeds as vector and convert to double
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double speedRws[4] = {static_cast<double>(speedRw0), static_cast<double>(speedRw1),
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static_cast<double>(speedRw2), static_cast<double>(speedRw3)};
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VectorOperations<double>::mulScalar(speedRws, 1e-1, speedRws, 4);
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VectorOperations<double>::mulScalar(speedRws, RPM_TO_RAD_PER_SEC, speedRws, 4);
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// calculate RPM offset utilizing the nullspace
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double rpmOffset[4] = {0, 0, 0, 0};
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double rpmOffsetSpeed = pointingLawParameters->nullspaceSpeed / 10 * RPM_TO_RAD_PER_SEC;
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VectorOperations<double>::mulScalar(acsParameters->rwMatrices.nullspaceVector, rpmOffsetSpeed,
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rpmOffset, 4);
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// calculate resulting angular momentum
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double rwAngMomentum[4] = {0, 0, 0, 0}, diffRwSpeed[4] = {0, 0, 0, 0};
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VectorOperations<double>::subtract(speedRws, rpmOffset, diffRwSpeed, 4);
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VectorOperations<double>::mulScalar(diffRwSpeed, acsParameters->rwHandlingParameters.inertiaWheel,
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rwAngMomentum, 4);
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// calculate resulting torque
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double nullspaceMatrix[4][4] = {{0, 0, 0}, {0, 0, 0}, {0, 0, 0}, {0, 0, 0}};
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MatrixOperations<double>::multiply(acsParameters->rwMatrices.nullspaceVector,
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acsParameters->rwMatrices.nullspaceVector, *nullspaceMatrix, 4,
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1, 4);
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MatrixOperations<double>::multiply(*nullspaceMatrix, rwAngMomentum, rwTrqNs, 4, 4, 1);
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VectorOperations<double>::mulScalar(rwTrqNs, -1 * pointingLawParameters->gainNullspace, rwTrqNs,
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4);
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}
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void PtgCtrl::ptgDesaturation(AcsParameters::PointingLawParameters *pointingLawParameters,
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const double *magFieldB, const bool magFieldBValid,
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const double *satRate, const int32_t speedRw0, const int32_t speedRw1,
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const int32_t speedRw2, const int32_t speedRw3, double *mgtDpDes) {
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if (not magFieldBValid or not pointingLawParameters->desatOn) {
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return;
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}
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// concentrate RW speeds as vector and convert to double
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double speedRws[4] = {static_cast<double>(speedRw0), static_cast<double>(speedRw1),
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static_cast<double>(speedRw2), static_cast<double>(speedRw3)};
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// convert magFieldB from uT to T
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double magFieldBT[3] = {0, 0, 0};
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VectorOperations<double>::mulScalar(magFieldB, 1e-6, magFieldBT, 3);
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// calculate angular momentum of the satellite
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double angMomentumSat[3] = {0, 0, 0};
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MatrixOperations<double>::multiply(*(acsParameters->inertiaEIVE.inertiaMatrixDeployed), satRate,
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angMomentumSat, 3, 3, 1);
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// calculate angular momentum of the reaction wheels with respect to the nullspace RW speed
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// relocate RW speed zero to nullspace RW speed
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double refSpeedRws[4] = {0, 0, 0, 0};
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VectorOperations<double>::mulScalar(acsParameters->rwMatrices.nullspaceVector,
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pointingLawParameters->nullspaceSpeed, refSpeedRws, 4);
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VectorOperations<double>::subtract(speedRws, refSpeedRws, speedRws, 4);
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// convert speed from 10 RPM to 1 RPM
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VectorOperations<double>::mulScalar(speedRws, 1e-1, speedRws, 4);
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// convert to rad/s
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VectorOperations<double>::mulScalar(speedRws, RPM_TO_RAD_PER_SEC, speedRws, 4);
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// calculate angular momentum of each RW
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double angMomentumRwU[4] = {0, 0, 0, 0};
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VectorOperations<double>::mulScalar(speedRws, acsParameters->rwHandlingParameters.inertiaWheel,
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angMomentumRwU, 4);
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// convert RW angular momentum to body RF
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double angMomentumRw[3] = {0, 0, 0};
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MatrixOperations<double>::multiply(*(acsParameters->rwMatrices.alignmentMatrix), angMomentumRwU,
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angMomentumRw, 3, 4, 1);
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// calculate total angular momentum
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double angMomentumTotal[3] = {0, 0, 0};
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VectorOperations<double>::add(angMomentumSat, angMomentumRw, angMomentumTotal, 3);
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// calculating momentum error
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double deltaAngMomentum[3] = {0, 0, 0};
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VectorOperations<double>::subtract(angMomentumTotal, pointingLawParameters->desatMomentumRef,
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deltaAngMomentum, 3);
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// resulting magnetic dipole command
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double crossAngMomentumMagField[3] = {0, 0, 0};
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VectorOperations<double>::cross(deltaAngMomentum, magFieldBT, crossAngMomentumMagField);
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double factor =
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pointingLawParameters->deSatGainFactor / VectorOperations<double>::norm(magFieldBT, 3);
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VectorOperations<double>::mulScalar(crossAngMomentumMagField, factor, mgtDpDes, 3);
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}
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void PtgCtrl::rwAntistiction(ACS::SensorValues *sensorValues, int32_t *rwCmdSpeeds) {
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bool rwAvailable[4] = {
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(sensorValues->rw1Set.state.value && sensorValues->rw1Set.state.isValid()),
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(sensorValues->rw2Set.state.value && sensorValues->rw2Set.state.isValid()),
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(sensorValues->rw3Set.state.value && sensorValues->rw3Set.state.isValid()),
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(sensorValues->rw4Set.state.value && sensorValues->rw4Set.state.isValid())};
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int32_t currRwSpeed[4] = {
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sensorValues->rw1Set.currSpeed.value, sensorValues->rw2Set.currSpeed.value,
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sensorValues->rw3Set.currSpeed.value, sensorValues->rw4Set.currSpeed.value};
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for (uint8_t i = 0; i < 4; i++) {
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if (rwAvailable[i]) {
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if (rwCmdSpeeds[i] != 0) {
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if (rwCmdSpeeds[i] > -acsParameters->rwHandlingParameters.stictionSpeed &&
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rwCmdSpeeds[i] < acsParameters->rwHandlingParameters.stictionSpeed) {
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if (rwCmdSpeeds[i] > currRwSpeed[i]) {
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rwCmdSpeeds[i] = acsParameters->rwHandlingParameters.stictionSpeed;
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} else if (rwCmdSpeeds[i] < currRwSpeed[i]) {
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rwCmdSpeeds[i] = -acsParameters->rwHandlingParameters.stictionSpeed;
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}
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}
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}
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}
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}
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}
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